add Coveralls settings
add Coveralls settings

gale320/gopher-lua,trigrass2/gopher-lua,insionng/gopher-lua,yuin/gopher-lua,cokeboL/gopher-lua,kohkimakimoto/gopher-lua,kohkimakimoto/gopher-lua,toophy/gopher-lua,insionng/gopher-lua,yuin/gopher-lua